10. 
    Radioactivity
    The spontaneous decay of an unstable atomic nucleus, giving rise to the emission of radiation, i.e. Alpha particles, Beta particles and Gamma rays.
    Found op http://www.theiet.org/factfiles/energy/nuclear-terms.cfm?type=pdf
    
    
11. 
    radioactivity
    the spontaneous release of energy in the form of high energy particles or radiation from atomic nuclei. Some elements essential for life, such as potassium, carbon, and hydrogen, have naturally occurring isotopes that are radioactive.
    Found op http://www.encyclo.co.uk/local/20842
    
    
12. 
    radioactivity
    <radiobiology> The quality of emitting or the emission of corpuscular or electromagnetic radiations consequent to nuclear disintegration, a natural property of all chemical elements of atomic number above 83 and possible of induction in all other known elements. ... (18 Nov 1997) ...
    Found op http://www.mondofacto.com/facts/dictionary?radioactivity
    
    
13. 
    radioactivity
    (ra″de-o-ak-tiv´ĭ-te) the emission of particulate or electromagnetic radiation as a result of decay of the nuclei of unstable elements, a property of all chemical elements of atomic number above 83, and possibly inducible in all other known elements. the quality of having such emissions....
    Found op http://www.encyclo.co.uk/local/21001
    
    
14. 
    radioactivity
    property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual ... [45 related articles]
    Found op http://www.britannica.com/eb/a-z/r/4
    
    
15. 
    radioactivity
    the quality of emitting or the emission of corpuscular or electromagnetic radiations consequent to nuclear disintegration, a natural property of all chemical elements of atomic number above 83, and possible of induction in all other known elements.
    Found op http://users.ugent.be/~rvdstich/eugloss/DIC/dictio74.html
    
    
16. 
    Radioactivity
    [song] "Radioactivity" (original German language title: "Radioaktivität") is a song written by Ralf Hütter, Florian Schneider and Emil Schult, and recorded by electronic band Kraftwerk as the title track of their 1975 album Radio-Activity. The song was released as a single in most European...
    Found op http://en.wikipedia.org/wiki/Radioactivity_(song)
    
    
17. 
    radioactivity
    Type: Term Pronunciation: rā′dē-ō-ak-tiv′i-tē Definitions: 1. The property of some atomic nuclei of spontaneously emitting gamma rays or subatomic particles (α and β rays) by the process of nuclear disintegration and measured in disintegrations per second (d...
    Found op http://www.medilexicon.com/medicaldictionary.php?t=74873
    
    
18. 
    Radioactivity
    The spontaneous decay of an unstable atomic nucleus, giving rise to the emission of radiation.
    Found op http://www.encyclo.co.uk/local/21076
    
    
19. 
    radioactivity
    property of certain nuclides of spontaneously emitting particles, gamma radiation, or X radiation NOTE - An element which presents radioactivity is called radioactive.
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=393-12-43
    
    
20. 
    radioactivity
    the property of certain nuclides of spontaneously emitting corpuscles or gamma radiation, or of emitting X-radiation following orbital electron capture, or of undergoing spontaneous nuclear fission
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-02-26
    
    
21. 
    radioactivity
    The spontaneous breaking apart, or decay, of unstable atomic nuclei. The three types of radioactive emission are alpha particles (nuclei of helium, which corresponds to a decrease in mass of the nucleus by four units), beta particles (fast-moving electrons, which corresponds to an increase in atomic...
    Found op http://www.daviddarling.info/encyclopedia/R/radioactivity.html
    
    
22. 
    radioactivity
    radioactivity, spontaneous disintegration or decay of the nucleus of an atom by emission of particles, usually accompanied by electromagnetic radiation. The energy produced by radioactivity has important military and industrial applications. However, the rays emitted by radioactive substances can ca...
    Found op http://www.infoplease.com/ce6/sci/A0840930.html
    
    

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